<PAGE>

                                                                   EXHIBIT 10.10

                              INDEMNITY AGREEMENT
                              -------------------

     This Agreement made and entered into as of this 9th day of August, 2000, by
and between Pure Resources, Inc., a Delaware corporation (the "Company"), and
[See Schedule I attached] ("Indemnitee"), who is currently serving the Company
in the capacity of a director and/or officer thereof;

                              W I T N E S S E T H:

     WHEREAS, the Company and Indemnitee recognize that the interpretation of
ambiguous statutes, regulations and court opinions and of the Certificate of
Incorporation and Bylaws of the Company, and the vagaries of public policy, are
too uncertain to provide the directors and officers of the Company with adequate
or reliable advance knowledge or guidance with respect to the legal risks and
potential liabilities to which they become personally exposed as a result of
performing their duties in good faith for the Company; and

     WHEREAS, the Company and the Indemnitee are aware that highly experienced
and capable persons are often reluctant to serve as directors or officers of a
corporation unless they are protected to the fullest extent permitted by law by
comprehensive insurance or indemnification, especially since the legal risks and
potential liabilities, and the very threat thereof, associated with lawsuits
filed against the officers and directors of a corporation, and the resultant
substantial time, expense, harassment, ridicule, abuse and anxiety spent and
endured in defending against such lawsuits, whether or not meritorious, bear no
reasonable or logical relationship to the amount of compensation received by the
directors or officers from the corporation; and

     WHEREAS, Section 145 of the General Corporation Law of the State of
Delaware, which sets forth certain provisions relating to the mandatory and
permissive indemnification of, and advancement of expenses to, officers and
directors (among others) of a Delaware corporation by such corporation, is
specifically not exclusive of other rights to which those indemnified thereunder
may be entitled under any bylaw, agreement, vote of stockholders or
disinterested directors or otherwise, and, thus, does not by itself limit the
extent to which the Company may indemnify persons serving as its officers and
directors (among others); and

     WHEREAS, after due consideration and investigation of the terms and
provisions of this Agreement and the various other options available to the
Company and the Indemnitee in lieu thereof, the board of directors of the
Company has determined that the following Agreement is not only reasonable and
prudent but necessary to promote and ensure the best interests of the Company
and its stockholders; and

     WHEREAS, the Company desires to have Indemnitee serve or continue to serve
as an officer and/or director of the Company, free from undue concern for
unpredictable, inappropriate or unreasonable legal risks and personal
liabilities by reason of his acting in good faith in the performance of his duty
to the Company; and Indemnitee desires to serve, or to continue to serve
(provided that he is furnished the indemnity provided for hereinafter), in
either or both of such capacities;
<PAGE>

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein set forth and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Company and Indemnitee,
intending to be legally bound, do hereby agree as follows:

     1.   Agreement to Serve.  Indemnitee agrees to serve or continue to serve
as director and/or officer of the Company, at the will of the Company or under
separate contract, if such exists, for so long as he is duly elected or
appointed and qualified in accordance with the provisions of the Bylaws of the
Company or until such time as he tenders his resignation in writing.

     2.   Definitions.  As used in this Agreement:

          (a)  The term "Proceeding" shall mean any action, suit or proceeding,
     whether civil, criminal, administrative, arbitrative or investigative, any
     appeal in such an action, suit or proceeding, and any inquiry or
     investigation that could lead to such an action, suit or proceeding, except
     one initiated by Indemnitee to enforce his rights under this Agreement.

          (b)  The term "Expenses" includes, without limitation, all reasonable
     attorneys' fees, retainers, court costs, transcript costs, fees of experts,
     witness fees, travel expenses, duplicating costs, printing and binding
     costs, telephone charges, postage, delivery service fees and all other
     disbursements or expenses of the types customarily incurred in connection
     with prosecuting, defending, preparing to prosecute or defend,
     investigating, or being or preparing to be a witness in a Proceeding.

          (c)  References to "other enterprise" shall include employee benefit
     plans; references to "fines" shall include any (i) excise taxes assessed
     with respect to any employee benefit plan and (ii) penalties; references to
     "serving at the request of the Company" shall include any service as a
     director, officer, employee or agent of the Company which imposes duties
     on, or involves services by, such director, officer, employee or agent with
     respect to an employee benefit plan, its participants or beneficiaries; and
     a person who acts in good faith and in a manner he reasonably believes to
     be in the interest of the participants and beneficiaries of an employee
     benefit plan shall be deemed to have acted in a manner "not opposed to the
     best interests of the Company" as referred to in this Agreement.

     3.   Indemnity in Third Party Proceedings.  The Company shall indemnify
Indemnitee in accordance with the provisions of this Section 3 if Indemnitee is
a party to or is threatened to be made a party to or otherwise involved in any
threatened, pending or completed Proceeding (other than a Proceeding by or in
the right of the Company to procure a judgment in its favor) by reason of the
fact that Indemnitee is or was a director and/or officer of the Company, or is
or was serving at the request of the Company as a director, officer, employee or
agent of another corporation, partnership, joint venture, trust or other
enterprise, against all Expenses, judgments, fines and amounts paid in
settlement actually and reasonably incurred by Indemnitee in connection with
such Proceeding, provided it is determined pursuant to Section 7 of this
Agreement or by the court having jurisdiction in the matter, that Indemnitee
acted in good faith and in a manner that he reasonably believed to be in or not
opposed to the best interests of the Company, and, with respect to any criminal
Proceeding, had no reasonable cause to believe his conduct was unlawful.  The
termination of any Proceeding by judgment, order, settlement or conviction, or
upon a plea of nolo contendere
<PAGE>

or its equivalent, shall not, of itself, create a presumption that Indemnitee
did not act in good faith and in a manner that he reasonably believed to be in
or not opposed to the best interests of the Company, and, with respect to any
criminal Proceeding, had reasonable cause to believe that his conduct was
unlawful.

     4.   Indemnity in Proceedings By or In the Right of the Company.  The
Company shall indemnify Indemnitee in accordance with the provisions of this
Section 4 if Indemnitee is a party to or is threatened to be made a party to or
otherwise involved in any threatened, pending or completed Proceeding by or in
the right of the Company to procure a judgment in its favor by reason of the
fact that Indemnitee is or was a director and/or officer of the Company, or is
or was serving at the request of the Company as a director, officer, employee or
agent of another corporation, partnership, joint venture, trust or other
enterprise, against all Expenses actually and reasonably incurred by Indemnitee
in connection with the defense, settlement or other disposition of such
Proceeding, but only if he acted in good faith and in a manner that he
reasonably believed to be in or not opposed to the best interests of the
Company, except that no indemnification shall be made under this Section 4 in
respect of any claim, issue or matter as to which Indemnitee shall have been
adjudged to be liable to the Company unless and only to the extent that the
Delaware Court of Chancery or the court in which such Proceeding was brought
shall determine upon application that, despite the adjudication of liability but
in view of all the circumstances of the case, Indemnitee is fairly and
reasonably entitled to indemnity for such Expenses as the Delaware Court of
Chancery or such other court shall deem proper.

     5.   Indemnification for Expenses of Successful Party.  Notwithstanding any
other provision of this Agreement to the contrary, to the extent that Indemnitee
has been successful on the merits or otherwise in defense of any Proceeding
referred to in Sections 3 and/or 4 of this Agreement, or in defense of any
claim, issue or matter therein, including dismissal without prejudice,
Indemnitee shall be indemnified against all Expenses actually and reasonably
incurred by Indemnitee in connection therewith.

     6.   Advances of Expenses.  The Expenses incurred by Indemnitee pursuant to
Sections 3 and/or 4 of this Agreement in connection with any Proceeding shall,
at the written request of the Indemnitee, be paid by the Company in advance of
the final disposition of such Proceeding upon receipt by the Company of an
undertaking by or on behalf of Indemnitee ("Indemnitee's Undertaking") to repay
such amount to the extent that it is ultimately determined that Indemnitee is
not entitled to be indemnified by the Company.  The request for advancement of
Expenses by Indemnitee and the undertaking to repay of Indemnitee, which need
not be secured, shall be substantially in the form of Exhibit A to this
                                                      ---------
Agreement.

     7.   Right of Indemnitee to Indemnification or Advancement of Expenses Upon
Application; Procedure Upon Application.

          (a)  If required by the terms of this Agreement, indemnification under
     Sections 3 and/or 4 of this Agreement shall be made no later than 45 days
     after receipt by the Company of the written request of Indemnitee.  A
     determination shall be made within said 45-day period by (i) a majority
     vote of the directors of the Company who are not parties to the involved
     Proceeding, even though less than a quorum, or (ii) independent legal
     counsel in a written opinion (which counsel shall be appointed if there are
     no such directors or if such
<PAGE>

     directors so direct), as to whether the Indemnitee has met the applicable
     standards for indemnification set forth in Section 3 or 4, as the case may
     be.

          (b)  Any advancement of Expenses under Section 6 of this Agreement
     shall be made no later than 10 days after receipt by the Company of
     Indemnitee's Undertaking.

          (c)  In any action to establish or enforce the right of
     indemnification or to receive advancement of Expenses as provided in this
     Agreement, the burden of proving that indemnification or advancement of
     Expenses is not appropriate shall be on the Company. Neither the failure of
     the Company (including its board of directors or independent legal counsel)
     to have made a determination prior to the commencement of such action that
     indemnification or advancement of Expenses is proper in the circumstances
     because Indemnitee has met the applicable standard of conduct, nor an
     actual determination by the Company (including its board of directors or
     independent legal counsel) that Indemnitee has not met such applicable
     standard of conduct, shall be a defense to the action or create a
     presumption that Indemnitee has not met the applicable standard of conduct.
     The Company shall also indemnify Indemnitee against all Expenses incurred
     by Indemnitee in connection with successfully establishing or enforcing his
     right of indemnification or to receive advancement of Expenses, in whole or
     in part, under this Agreement.

     8.   Indemnification and Advancement of Expenses Under this Agreement Not
Exclusive. The rights of indemnification and to receive advancement of Expenses
as provided by this Agreement shall not be deemed exclusive of any other rights
to which Indemnitee may be entitled under the Certificate of Incorporation or
Bylaws of the Company, any other agreement, any vote of stockholders or
disinterested directors, the General Corporation Law of the State of Delaware,
or otherwise, both as to action in his official capacity and as to action in
another capacity while holding such office.

     9.   Partial Indemnification.  If Indemnitee is entitled under any
provision of this Agreement to indemnification or to receive advancement by the
Company for a portion of the Expenses, judgments, fines or amounts paid in
settlement actually and reasonably incurred by Indemnitee in the investigation,
defense, appeal, settlement or other disposition of any Proceeding but not,
however, for the total amount thereof, the Company shall nevertheless indemnify
Indemnitee for the portion thereof to which Indemnitee is entitled.

     10.  Rights Continued.  The rights of indemnification and to receive
advancement of Expenses as provided by this Agreement shall continue as to
Indemnitee even though Indemnitee may have ceased to be a director or officer of
the Company and shall inure to the benefit of Indemnitee's personal or legal
representatives, executors, administrators, successors, heirs, distributees,
devisees and legatees.

     11.  No Construction as an Employment Agreement or Any Other Commitment.
Nothing contained in this Agreement shall be construed as giving Indemnitee any
right to be retained in the employ of the Company or any of its subsidiaries, if
Indemnitee currently serves as an officer of the Company, or to be renominated
as a director of the Company, if Indemnitee currently serves as a director of
the Company.
<PAGE>

     12.  Liability Insurance.  To the extent the Company maintains an insurance
policy or policies providing directors' and officers' liability insurance,
Indemnitee shall be covered by such policy or policies in accordance with its or
their terms, to the maximum extent of the coverage available for any director or
officer of the Company under such policy or policies.

     13.  No Duplication of Payments.  The Company shall not be liable under
this Agreement to make any payment of amounts otherwise indemnifiable under this
Agreement if, and to the extent that, Indemnitee has otherwise actually received
such payment under any contract, agreement or insurance policy, the Certificate
of Incorporation or Bylaws of the Company, or otherwise.

     14.  Subrogation.  In the event of payment under this Agreement, the
Company shall be subrogated to the extent of such payment to all the rights of
recovery of Indemnitee, who shall execute all papers required and shall do
everything that may be necessary to secure such rights, including without
limitation the execution of such documents as may be necessary to enable the
Company effectively to bring suit to enforce such rights.

     15.  Exceptions.  Notwithstanding any other provision in this Agreement,
the Company shall not be obligated pursuant to the terms of this Agreement, to
indemnify or advance Expenses to Indemnitee with respect to any Proceeding, or
any claim therein, (i)  brought or made by Indemnitee against the Company, or
(ii) in which final judgment is rendered against Indemnitee for an accounting of
profits made from the purchase and sale or the sale and purchase by Indemnitee
of securities of the Company pursuant to the provisions of Section 16(b) of the
Securities Exchange Act of 1934, as amended, or similar provisions of any
federal, state or local statute.

     16.  Notices.  Any notice or other communication required or permitted to
be given or made to the Company or Indemnitee pursuant to this Agreement shall
be given or made in writing by depositing the same in the United States mail,
with postage thereon prepaid, addressed to the person to whom such notice or
communication is directed at the address of such person on the records of the
Company, and such notice or communication shall be deemed given or made at the
time when the same shall be so deposited in the United States mail.  Any such
notice or communication to the Company shall be addressed to the Secretary of
the Company.

     17.  Contractual Rights.  The right to be indemnified or to receive
advancement of Expenses under this Agreement (i) is a contract right based upon
good and valuable consideration, pursuant to which Indemnitee may sue, (ii) is
and is intended to be retroactive and shall be available as to events occurring
prior to the date of this Agreement and (iii) shall continue after any
rescission or restrictive modification of this Agreement as to events occurring
prior thereto.

     18.  Severability.  If any provision or provisions of this Agreement shall
be held to be invalid, illegal or unenforceable for any reason whatsoever, the
validity, legality and enforceability of the remaining provisions shall not in
any way be affected or impaired thereby; and, to the fullest extent possible,
the provisions of this Agreement shall be construed so as to give effect to the
intent manifested by the provisions held invalid, illegal or unenforceable.

     19.  Successors; Binding Agreement.  The Company shall require any
successor to all or substantially all of the business and/or assets of the
Company (whether direct or indirect, by
<PAGE>

purchase, merger, consolidation or otherwise), by agreement in form and
substance reasonably satisfactory to Indemnitee, to expressly assume and agree
to perform this Agreement in the same manner and to the same extent that the
Company would be required to perform if no such succession had taken place. As
used in this Agreement, "Company" shall mean the Company as hereinbefore defined
and any successor to its business and/or assets as aforesaid that executes and
delivers the agreement provided for in this Section 19 or that otherwise becomes
bound by the terms and provisions of this Agreement by operation of law.

     20.  Counterparts, Modification, Headings, Gender.

          (a)  This Agreement may be executed in counterparts, each of which
     shall constitute one and the same instrument, and either party hereto may
     execute this Agreement by signing any such counterpart.

          (b)  No provisions of this Agreement may be modified, waived or
     discharged unless such waiver, modification or discharge is agreed to in
     writing and signed by Indemnitee and an appropriate officer of the Company.
     No waiver by any party at any time of any breach by any other party of, or
     compliance with, any condition or provision of this Agreement to be
     performed by any other party shall be deemed a waiver of similar or
     dissimilar provisions or conditions at the same time or at any prior or
     subsequent time.

          (c)  Section headings are not to be considered part of this Agreement,
     are solely for convenience of reference, and shall not affect the meaning
     or interpretation of this Agreement or any provision set forth herein.

          (d)  Pronouns in masculine, feminine and neuter genders shall be
     construed to include any other gender, and words in the singular form shall
     be construed to include the plural and vice versa, unless the context
     otherwise requires.

     21. Assignability. This Agreement shall not be assignable by either party
without the consent of the other.

     22. Exclusive Jurisdiction; Governing Law. The Company and Indemnitee agree
that all disputes in any way relating to or arising under this Agreement,
including, without limitation, any action for advancement of Expenses or
indemnification, shall be litigated, if at all, exclusively in the Delaware
Court of Chancery, and, if necessary, the corresponding appellate courts. This
Agreement shall be governed by and construed and enforced in accordance with the
laws of the State of Delaware applicable to contracts made and to be performed
in such state without giving effect to the principles of conflicts of laws. The
Company and Indemnitee expressly submit themselves to the personal jurisdiction
of the State of Delaware.

     23. Termination.

          (a)  This Agreement shall terminate upon the mutual agreement of the
     parties that this Agreement shall terminate or upon the death of Indemnitee
     or the resignation, retirement, removal or replacement of Indemnitee from
     all of his positions as a director and/or officer of the Company.
<PAGE>

          (b)  The termination of this Agreement shall not terminate:

               (i)  the Company's liability for claims or actions against
          Indemnitee arising out of or related to acts, omissions, occurrences,
          facts or circumstances occurring or alleged to have occurred prior to
          such termination; or

               (ii) the applicability of the terms and conditions of this
          Agreement to such claims or actions.

     IN WITNESS WHEREOF, the Company and Indemnitee have executed this Agreement
as of the date and year first above written.

                                        PURE RESOURCES, INC.


                                        By:  /s/ Jack Hightower*
                                            -----------------------------------
                                            Name: Jack Hightower
                                                  -----------------------------
                                            Title: Chairman, President, CEO
                                                  -----------------------------

                                        INDEMNITEE


                                        /s/ [See Schedule I attached]
                                        ---------------------------------------
                                        [See Schedule I attached]


                                        [*Note: agreement of Jack Hightower was
                                          Signed on behalf of Pure Resources,
                                          Inc. by William K. White, Vice
                                          President]
<PAGE>

                                                                       EXHIBIT A

                            INDEMNITEE'S UNDERTAKING

                               ___________, 2000


Pure Resources, Inc.
500 W. Texas Avenue, Suite 200
Midland, Texas 79701

          Re:  Indemnity Agreement

Ladies and Gentlemen:

     Reference is made to the Indemnity Agreement dated as of August 9, 2000 by
and between Pure Resources, Inc. and the undersigned Indemnitee, and
particularly to Section 6 thereof relating to advance payment by the Company of
certain Expenses incurred by the undersigned Indemnitee. Capitalized terms used
and not otherwise defined in this Indemnitee's Undertaking shall have the
respective meanings given to such terms in the Agreement.

     The undersigned Indemnitee has incurred Expenses pursuant to Section 3
and/or 4 of the Agreement in connection with a Proceeding.  The types and
amounts of Expenses are itemized on Attachment I to this Indemnitee's
Undertaking.  The undersigned Indemnitee hereby requests that the total amount
of these Expenses (the "Advanced Amount") be paid by the Company in advance of
the final disposition of such Proceeding in accordance with the Agreement.

     The undersigned Indemnitee hereby agrees to repay the Advanced Amount to
the Company to the extent that it is ultimately determined that the undersigned
Indemnitee is not entitled to be indemnified therefor by the Company.  This
agreement of Indemnitee to repay shall be unsecured.

                                    Very truly yours,



                                    _______________________________________
                                    Signature

                                    ________________________________________
                                    Name of Indemnitee (Type or Print)
<PAGE>

                                ATTACHMENT I TO
                            INDEMNITEE'S UNDERTAKING

                                 ITEMIZATION OF
                         TYPES AND AMOUNTS OF EXPENSES
                         -----------------------------


     Attached hereto are receipts, statements or invoices for the following
qualifying Expenses which Indemnitee represents have been incurred by Indemnitee
in connection with a Proceeding:

          Type                                Amount
          ----                                ------


1.




                                             ---------
     Total Advanced Amount
                                             =========
<PAGE>

                                   Schedule I

1.   Jack D. Hightower
2.   George G. Staley
3.   William K. White
4.   Dan P. Colwell
5.   Gary Dupriest
6.   Thomas H. Moore
7.   Rodney L. Woodard
8.   John L. Benfatti
9.   Susan D. Rowland
10.  Darin G. Holderness
11.  Graydon H. Laughbaum, Jr.
12.  H D Maxwell
13.  Herbert C. Williamson, III
14.  Keith Covington
15.  Timothy H. Ling
16.  Darrell Chessum